<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>首页</title>
    <style>
        body {
            margin: 0;
            padding: 0;
            background-image: url('cover.png');
            background-size: cover;
            background-position: center;
            height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative
        }

        button {
            background-color: rgb(244,164,96); 
            color: white;
            font-size: 36px;
            padding: 10px 25px;
            border: none;
            cursor: pointer;
	    position: absolute; /* 设置绝对定位 */
            bottom: calc(100vh / 4); /
        }
    </style>
</head>
<body>
    <button onclick="window.location.href='spectrogram.html'">欢迎</button>
</body>
</html>
